sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

// toggle visibility 

function toggle( targetId ){
if (document.getElementById){
		target = document.getElementById( targetId );
			if (target.style.display == "none"){
				target.style.display = "";
			} else {
				target.style.display = "none";
			}
	}
}